Means for venting core boxes



Jano 15, H. L. DEMMLER MEANS FOR VENTING CORE BOXES Filed Aug. 13. 1921 Fig. 4.

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n" l Q Patented Jan. 15, 1924.

UNITED STATES A HENRY L. DIEMMLER, OF KEWANEE, ILLINOIS.

MEANS ron vEN'rING coanfsoxns.

Application iued'august 1s, 1921. serial mi 49am.

To all whom t may concern:

Be it known that I, HENRY L. DEMMLER, a citizen of the United States of America, residing at Kewanee, in the county of Henry and State of Illinois, have invented a new and useful Means for Venting Core Boxes, of which the following is a specification.

My' invention relates to molds or core l0 boxes to be used in connection with mold or core making machines of the so-called Hewlett type, in ,which a mold or core box is clamped against a sand container from which sand is forced into the mold or core l box by compressed air. I find that the compressed air passing into the mold or core box and also'the atmospheric air in the empty moldor core box together retard the roper How of sand into the mold or core ox and prevent the proper formation and packing of the sand. The principal object of my invention is to provide for the proper escape vof air fr m the moldor core box b inexpensive and convenient means.

Figure 1 is a vertical sectional View, somewhat diagrammatic, of a core box embodying the invention in position ina core making machine.

Figure 2 is a plan view of a perforated plug forming part of the invention.

gigure 3 is a vertical section of the plug.

1 formlilig part of the invention. :i5 Figure 5 isa plan view ofthe core box. Figure 6 is a plan view of a plug similar to Figure2. f

The machine illustrated in Figure 1 comprises a frame 1 which supports a pressure ead 2 anda sand container 3. The sand container 3 is provided with a ,removable head 4 and a removable bottom plate 5 formed with an aperture 6, the heads being secured tothe sand container by screws a. e5 The sand-container 3 is connected with' a source of compressed air .or other pressure uid by a pipe 13. A piston 9 is vertically slidable on the pressure head 2 and is operable bythe control of compressed air nor 60 other pressure Huid through the pipe 10 p which JcommunicatesY with a suitable source of supply.

re 4 is a side elevation of a core box cups secured in the respective openin The mold or core is to be formed in the mold or core box 7 by clamping thelatter pneumatically between the head of the cylinder 9 and a bottom plate 5 of the sand container and then forcing sand 11 from the sand container 3 into the mold or core box by compressed air. The walls of the mold or core box 7 are formed with apertures in each of which is secured a plug 8 formed with a plurality of small perforations, the perforated-surface of the plug forming part of the molding surfacel of the core box as illustrated in the drawings. It will be understood, of coursethat the mold or core box l7 shown in the drawings is illustrative .only and may be of any desired form and that the-size and location of the apertures in its wall and the size and number of the perforationsin the plugs Awill'vary in accordance with the size and form` of the mold or core box and with the grade of sand being used. The perforations in the plug, of course, are `of such size as to ermit the passage of air while preventing t e passage of sand, and in practice I find it preferable to make the plugs in the form of perforated brass cups.

After a mold or core box has -been clamped against the bottom plate of the sand contalner, compressed air or other pressure-fluid is admitted to the sand container and forces the sand into the mold' or core box. Egress of sand from the mold or core box is effectively prevented but air may Afreely escape from the mold or core box in every desirableplace and direc-tion so that .the sand will be very compactly and firmly formed in the mold or core box.

Having thus described my invention, `what I claim as new and desire to secure by Letters Patent of the United States is 2- 1. A 'mold or core box provided with outlet openings, and perforated plugs secured in the respective openings.

2. A mold or core box provided with outlet openings, and hollow metal perforated 3. A mold or core box providedwlth outlet openings in its molding surface, and perforated plugs secured in the respective open-A ings and forming part ofthe molding Surface.

let openlngs in its mol ing surface, and purposedescribed. hollow metal perforated cups secured in the In testimony whereof, I hereunto set my respective openings and forming part of the hand. a molding surface.

5. A perforated plug adaptedto be secured in a mold or core box, or the pur- Witnesses: pose described. ROY B. PoPPLEToN, 6. A hollow metal perforated cup adapted CHARLES G. PONTE.

4. A Inold or core box` rovided with outto be secured in a mold or core box, for the l" HENRY L. DEMMLER. 

